body{
	background-image: url("../img/草地.jpg");
	background-size: 100%;	
}
.div1{
	padding: 10px;
	max-width: 500px;
	margin: auto;
	margin-top: 60px; 
	border-radius: 50px;
	background-color: #aaff7f;
}
h2 {
   text-align: center;
   font-size: 30px;
  }
.navt{width: 1000px; margin: 0 auto; background-color: #4949dc; height: 40px; padding:5px 15px; margin-bottom: 15px; line-height: 40px; margin-top:60px }
#menu{width:1000px;height:45px;background-color:#87caca;}
#menu li{position:relative;float:left;width:180px;border:none;text-align:center;line-height:40px; list-style:none;}
#menu li a{display:block;outline:0;color:#000000;text-decoration:none;font-size:25px;}
.one{
	border: 1px;
	margin: 0 auto; 
	width:800px;
	height:500px;
	background-color: #28A9E0;
}
.two{
	padding: 26px;
	 max-width: 600px;
	 margin: auto;
	 margin-top: 50px; 
	 background-image: url(../img/3.jpg);
	 border-radius: 20px;
}
.three{
	align-items: center;
	border-radius: 20px;
}
.four{
    background-color: #4CAF50;
    color: white;
	border: none;
	cursor: pointer;
}
